Nope, never heard of it, but today for the first time ever I connected my Amazon portable Tap to the hotspot of my iPhone. It was a real pain, but I got it done after a few reboots and retries. My advice is, keep trying.
Also, like you, I have a Dot designated as a floater. Took it with us at TG time on vacation. Just had to connect the wi-fi to our rental place router, and reset the zip code for accurate weather.